import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'
import Welcome from './components/Welcome.vue'
import Users from './components/user/Users.vue'

Vue.use(Router)

const router = new Router({
  routes: [
    { path: '/', redirect: '/login' },
    { path: '/login', component: Login },
    { 
     path: '/home',
     component: Home,
     redirect:'/welcome',
     children:[
      { path: '/welcome',  component: Welcome },
      {path:'/users',component:Users}]
     }
  ]
})

//挂载路由导航守卫
router.beforeEach((to,from,next)=>{
  //to 将要访问的路径
  //from 代表从哪个路径跳转而来
  //next 是一个函数，表示放行
  // next() 放行 next('/login') 强制跳转

  if(to.path === '/login') return next();
  //获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
   next()
})

export default router